meteor-slingshot/S3: How HTTP requests work between slingshot and S3 -


i'm beginner developer trying understand how 'backend' processes work when uploading files web app.

i'm using edgee:slingshot in meteor project upload images amazon s3. understanding file upload slingshot makes post request s3 in order upload file bucket. confirm chrome console can see post request (after preflight options request) s3.

however post request count in s3 increased 4 after uploading image. did not upload else, , there 1 other file in bucket not being used anywhere.

is normal behaviour? not know nuts , bolts of http requests bit mystifying. interested because s3 prices according (amongst other things) number of requests made.

bonus question: number of requests increased (by 3, not 4) after uploading image. normal behaviour? slingshot upload function returns download url of image in bucket. did not think making requests.

is there kind of behind-the-scenes validation/batch upload going on causing this?

thanks help.


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